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  <h3 align="center">各种阴影效果</h3>
  <div class="shadow-none p-3 mb-5">去除阴影效果</div>
  <div class="shadow-sm p-3 mb-5 ">小的阴影</div>
  <div class="shadow p-3 mb-5 ">正常的阴影</div>
  <div class="shadow-lg p-3 mb-5 ">大的阴影</div>
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